Well, although English is my second language, I have studied in U.S since I was 15.
I admit my English isn't probably as perfect as it could be, but I have done pretty well in TOEFL (the english proficiency test), and have taken SAT, and finished my B.S in UW-Madison. So I think it's fair to say that I am used to studying in English.
However, a lot of biological terms were tough to remember since I wasn't familiar with them (you don't encounter terms like diptera, musca, ulna, femur everyday), and I was simply curious if it was the same for even native speakers.
Not that I am whining, but I believe there is nothing wrong w/ complaning.
What's important is whether you get it done or not.